Philips FC6404 Cordless Vacuum Replacement Battery 18.5V 2500mAh
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Philips FC6404 Cordless Vacuum Replacement Battery 18.5V 2500mAh - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
Battery Care Tips
🔹 Getting Started
Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.
🔹 Keep It Healthy
Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.
Delivery and Shipping
Delivery and Shipping
🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.
Disclaimer
Disclaimer
⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.
🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
Philips FC6404 Cordless Vacuum Replacement Battery 18.5V 2500mAh - is backordered and will ship as soon as it is back in stock.
Voltage
18.5V
Amp
2500mAh
Philips FC6404 / FC6405 Series — 18.5V Li-ion Replacement Battery (5ICR19/65)
This 18.5V, 2500mAh Li-ion battery replaces the original cell pack in the Philips FC6404, FC6405, FC6168, and FC6169 cordless handheld vacuums. It matches the OEM voltage rail and connector layout for these models. Capacity is 2500mAh (46.25Wh), consistent with the original specification.
- FC6404 / FC6405 / FC6168 / FC6169 compatibility: These models share the same 18.5V motor drive circuit, battery connector pinout, and BMS communication protocol — one cell pack covers the group without modification.
- Bench tested on actual hardware: We cycled this battery through discharge under sustained motor load. The BMS held the voltage curve within spec and triggered protection cutoff correctly at the low-voltage threshold without false trips.
- Dock charging behaviour on the FC6404: Do not leave the vacuum sitting on the charging dock permanently. Continuous dock contact applies a trickle current after the cell reaches full charge, accelerating capacity fade over months. Charge to full, then remove from the dock.
Suction dropping before the battery indicator reaches low
This happens when the motor draws more current than the battery's discharge curve can sustain at that state of charge. A partially blocked filter forces the motor to work harder, pulling current spikes that drag cell voltage down early. The BMS reads the voltage drop and begins throttling power before the indicator registers a problem. Clear the filter first — if suction recovers, the battery is not the fault.
Motor cuts out mid-clean then restarts after a pause
This is a BMS overcurrent trip, not a dead battery. When suction is restricted — blocked nozzle, clogged filter, or hair wrapped around the brush — the motor stalls briefly and draws a current spike above the BMS threshold. The BMS shuts the output, the motor stops, and the circuit resets after a few seconds. Check and clear any blockage, then restart. If cut-outs continue on a clean vacuum, measure resting cell voltage — a healthy pack should read at or above 18.5V after a full charge.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Philips
- Manufacturer: CS
- Series: Standard
- Color: Black
- Product Type: Li-ion
- Battery Type: Li-ion
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
My Philips FC6404 loses suction halfway through a clean but the battery light still shows full — what's going on?
The battery indicator reflects charge state, not the voltage sag happening under load. A restricted filter forces the motor to draw more current than the cell can deliver cleanly at that point in the discharge curve, and voltage drops early. Remove and clean the filter, then retest. If suction holds after that, the battery is fine — the filter was the restriction.
The motor on my FC6405 keeps cutting out for a few seconds then comes back on — is the battery faulty?
That stop-and-restart pattern is a BMS overcurrent trip, not a dead cell. Sustained restricted airflow — blocked nozzle, clogged filter, or a hair jam in the brush — causes the motor to stall and spike current above the BMS limit, which shuts output briefly. Clear every blockage in the air path and retry. If the cut-outs stop, the battery is working correctly; if they continue on a fully clear vacuum, charge to full and check that resting voltage reads at or above 18.5V.
I left my FC6404 on the charging dock all the time and the battery now barely holds charge — did the charger damage it?
Continuous dock contact after a full charge applies a slow trickle current that stresses Li-ion cells over weeks and months, causing measurable capacity fade. The original cell and this replacement are both vulnerable to the same pattern. Going forward, charge to full and remove the vacuum from the dock rather than leaving it docked between uses. Capacity lost to trickle damage cannot be recovered, but the degradation stops immediately once the dock habit changes.
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